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Science 16 October 1992:
Vol. 258. no. 5081, pp. 475 - 478
DOI: 10.1126/science.1411545
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Articles
Science, Vol 258, Issue 5081, 475-478
Copyright © 1992 by American Association for the Advancement of Science
DNA polymerase beta and DNA synthesis in Xenopus oocytes and in a nuclear extract
TM Jenkins,
JK Saxena,
A Kumar,
SH Wilson,
and
EJ Ackerman
Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892.
The identities of the DNA polymerases required for conversion of single-strand (ss) M13 DNA to double-strand (ds) M13 DNA were examined both in injected Xenopus laevis oocytes and in an oocyte nuclear extract. Inhibitors and antibodies specific to DNA polymerases alpha and beta were used. In nuclear extracts, inhibition by the antibody to polymerase beta could be reversed by purified polymerase beta. The polymerase beta inhibitors, dideoxythymidine triphosphate (ddTTP) and dideoxycytidine triphosphate (ddCTP), also blocked DNA synthesis and indicated that polymerase beta is involved in the conversion of ssDNA to dsDNA. These results also may have particular significance for emerging evidence of an ssDNA replication mode in eukaryotic cells.
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